Lets a briefing scene materialize only the preload-tagged actors from a
scenario .pss (player placement markers, briefing props) without
clearing the current world, pushing timeline data, registering ActorIds,
or starting any auto-play. The actors spawned by each LoadSceneAdditive
call are tracked in a static TWeakObjectPtr array; UnloadSceneAdditive
destroys every still-valid one and clears the array.
Typical BP usage on scenario change:
UnloadSceneAdditive(this) -> LoadSceneAdditive(this, NewSceneName)
No BP-side bookkeeping required. Filter defaults to PreloadOnly which
matches the intended briefing use case; the parameter stays exposed for
other niche cases (ExcludePreload, All).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
j.foucher
f6efc00c73